The series of crests and troughs that are developed on the surface of water by dragging effects of winds is called….
a) waves
b) tides
c) currents
d) none of these
How many types of waves are there?
a) one
b) two
c) three
d) four
Explanation:ripples, chops, swells, tsunamis
Which of the following are smallest waves?
a) ripples
b) tsunamis
c) swells
d) chops
Waves are caused by…….
a) Earth rotation
b) wind
c) regular movement of water
d) none of these
Tides (مدوجزر):
Periodical rise and fall of the sea level due to the force of attraction of the moon and the sun is called….
a) waves
b) tides
c) currents
d) none of these
